LGF’s new two-factor signin has many of the same features as Google’s two-factor signin, including a list of single-use backup codes you can use if you ever get separated from your cell phone and your authenticator app.

The only thing I’m unable to fully test is the cell phone SMS support, because I only have access to an AT&T carrier. But I believe without testing it all that it should work with 10 common cell phone carriers:

Altel
AT&T
Boost Mobile
Sprint
T-Mobile
Unicel
U.S. Cellular
Verizon
Virgin Mobile Canada
Virgin Mobile USA

If your carrier isn’t in the list you’ll still be able to use an authenticator app.